sql - 复合外键引用2个不同的表

Question

我创建了3个表Student，Department和Major_in。

我想在email, Department_ID的（Major_in）上创建一个复合外键，该外键引用email的主键Student和Department_ID的Department。

CREATE TABLE Student
(
    email VARCHAR(20) PRIMARY KEY
);

CREATE TABLE Department
(
    Department_ID INTEGER PRIMARY KEY
);

CREATE TABLE Major_in 
(
    email VARCHAR(20), 
    Department_ID INTEGER,
    FOREIGN KEY (roll, Department_ID) 
         REFERENCES (Student(email), Department(Department_ID)
);

但是我得到了错误


错误：“（”附近：语法错误in sqlite3`

Answer 1

弄清楚这样做是有效的，是一个基本的语法错误。

CREATE TABLE Major_in
(
    email REFERENCES Student, 
    Department_ID REFERENCES Department, 
    PRIMARY KEY (email, Department_ID)
);